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Each student carried 850 ml bottle,so:
1 student:850 ml bottle

Since there are 10 students:
10 students(\frac{850 ml bottle}{1 student})=8,500 ml

Since the conversion:
1 L=1,000 ml

8,500 ml(\frac{1L}{1,000 ml})=8.5 L

Hope this helps =)